When I read the article, I got the feeling that the code would need to be modified to work for bass, since the code seemed to be based on the lowest harmonic of a guitar. Whenever I got around to this project, I was planning on doing it with a bypass, add an audio-in jack for whatever midi module I planned on using, and a blend control for original bass signal vs. the midi module. That way, I can run the synth to the same amp, and potentially overlap the sounds if I wanted.